ScalarHandler (Apache Commons DbUtils 1.8.0 API)

java.lang.Object
- org.apache.commons.dbutils.handlers.ScalarHandler<T>

Type Parameters:

T - The type of the scalar

All Implemented Interfaces:

ResultSetHandler<T>
```
public class ScalarHandler<T>
extends Object
implements ResultSetHandler<T>
```
ResultSetHandler implementation that converts one ResultSet column into an Object. This class is thread safe.

See Also:

ResultSetHandler

Constructor Summary

Constructors
Constructor	Description
`ScalarHandler()`	Creates a new instance of ScalarHandler.
`ScalarHandler(int columnIndex)`	Creates a new instance of ScalarHandler.
`ScalarHandler(String columnName)`	Creates a new instance of ScalarHandler.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`T`	`handle(ResultSet resultSet)`	Returns one `ResultSet` column as an object via the `ResultSet.getObject()` method that performs type conversions.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ScalarHandler
```
public ScalarHandler()
```
    Creates a new instance of ScalarHandler. The first column will be returned from handle().
  - ScalarHandler
```
public ScalarHandler(int columnIndex)
```
    Creates a new instance of ScalarHandler.
    
    Parameters:
    
    columnIndex - The index of the column to retrieve from the ResultSet.
  - ScalarHandler
```
public ScalarHandler(String columnName)
```
    Creates a new instance of ScalarHandler.
    
    Parameters:
    
    columnName - The name of the column to retrieve from the ResultSet.
- Method Detail
  - handle
```
public T handle(ResultSet resultSet)
         throws SQLException
```
    Returns one ResultSet column as an object via the ResultSet.getObject() method that performs type conversions.
    
    Specified by:
    
    handle in interface ResultSetHandler<T>
    
    Parameters:
    
    resultSet - ResultSet to process.
    
    Returns:
    
    The column or null if there are no rows in the ResultSet.
    
    Throws:
    
    SQLException - if a database access error occurs
    
    ClassCastException - if the class datatype does not match the column type
    
    See Also:
    
    ResultSetHandler.handle(java.sql.ResultSet)